Reproductive capacity of sea urchin centrosomes without centrioles.

Reproductive capacity of sea urchin centrosomes without centrioles.
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无中心粒的海胆中心体的繁殖能力。

DOI:
10.1002/cm.970130405
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发表时间:
1989
影响因子:
--
通讯作者:
Rieder,CL
Rieder,CL
中科院分区:
--
文献类型:
--
作者:
Sluder,G;Miller,FJ;Rieder,CL

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对于动物细胞,中心粒和中心粒周围物质(中心体微管组织中心)在控制有丝分裂前中心体精确加倍中的相对作用尚未得到很好的定义。为此,我们设计了一个实验系统,使我们能够表征中心体微管组织中心的能力,经常在中心粒的情况下加倍。海胆卵受精后,剥去受精膜,并在融合前破碎。那些只含有雌性原核的激活的卵碎片在第一次有丝分裂时组装成一个单体。连续切片的超微结构分析表明,这种monasters的径向排列的微管组织由一个中空的有孔的电子致密物质的球体,相同的外观作为pericentriolar材料,这是缺乏中心粒。我们通过至少三个细胞周期跟踪只有一个雌性原核的单个片段,发现单体在有丝分裂之间没有加倍。只有一个雄性原核的碎片以正常的方式重复分裂的观察表明,单体的组装和行为不是卵碎片化的产物。我们的研究结果表明,控制有丝分裂前的中心体精确加倍的活动是不同的,实验分离的中心体微管组织中心。我们的观察还扩展了中心体的生殖能力与其所含中心粒数量之间的相关性(G Sluder和CL里德尔,1985 a:J. Cell Biol.100:887-896)。对于一个细胞,通常有中心粒,我们表明,没有中心粒的中心体不会复制之间的有丝分裂。
For animal cells, the relative roles of the centrioles and the pericentriolar material (the cenrosomal microtubule organizing center) in controlling the precise doubling of the centrosome before mitosis have not been well defined. To this end we devised an experimental system that allowed us to characterize the capacity of the centrosomal microtubule organizing center to double regularly in the absence of centrioles. Sea urchin eggs were fertilized, stripped of their fertilization envelopes, and fragmented before syngamy. Those activated egg fragments containing just the female pronucleus assembled a monaster at first mitosis. A serial section ultrastructural analysis of such monasters revealed that the radially arrayed microtubules were organized by a hollow fenestrated sphere of electrondense material, of the same appearance as pericentriolar material, that was devoid of centrioles. We followed individual fragments with only a female pronucleus through at least three cell cycles and found that the monasters did not double between mitoses. The observation that fragments with only a male pronucleus repeatedly divided in a normal fashion indicates that the assembly and behavior of monasters were not artifacts of egg fragmentation. Our results demonstrate that the activity that controls the precise doubling of the centrosome before mitosis is distinct and experimentally separable from the centrosomal microtubule organizing center. Our observations also extend the correlation between the reproductive capacity of a centrosome and the number of centrioles it contains (G Sluder and CL Rieder, 1985a: J. Cell Biol. 100:887–896). For a cell that normally has centrioles, we show that a centrosome without centrioles does not reproduce between mitoses.
DOI: --
发表时间: 1976
影响因子: 7.8
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影响因子: 6.6
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影响因子: 2.7
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